n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 21 |
3 | 270 |
4 | 4212 |
5 | 77760 |
6 | 1662120 |
7 | 40415760 |
8 | 1102248000 |
9 | 33331979520 |
10 | 1107097891200 |
11 | 40069801094400 |
12 | 1569793384051200 |
13 | 66185883219456000 |
14 | 2988292627358438400 |
15 | 143855017177487616000 |
16 | 7355369573944584192000 |
17 | 398090614491857903616000 |
18 | 22737098558477268725760000 |
[1,2,21,270,4212,77760,1662120,40415760, 1102248000,33331979520,1107097891200, 40069801094400,1569793384051200,66185883219456000, 2988292627358438400,143855017177487616000, 7355369573944584192000,398090614491857903616000, 22737098558477268725760000] |